<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
  <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滑动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
       <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
         <!-- 二级分类的标题 -->
         <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
         <!-- 当前二级分类下的三级分类列表 -->
         <view class="cate-lv3-list">
           <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodList(item3)">
             <!-- 三级分类的图片 -->
             <image :src="item3.cat_icon"></image>
             <!-- 三级分类的文本 -->
             <text>{{item3.cat_name}}</text>
             
           </view>
         </view>
         
       </view>
      </scroll-view>
      
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js';
  export default {
      mixins:[badgeMix],
    data() {
      return {
        wh:0,
        //一级分类的列表
        cateList:[],
        active:0,
        //二级分类的列表
        cateLevel2:[],
        //滚动条距离顶部的距离
        scrollTop:0
      };
    },
    onLoad(){
      const sysInfo=uni.getSystemInfoSync()
      this.wh=sysInfo.windowHeight-50
      this.getCateList()
    },
    methods:{
    async   getCateList(){
    const {data:res} =await uni.$http.get('api/public/v1/categories')
    if(res.meta.status!==200){
      return uni.showToast({
        title:'数据加载失败',
        duration:1500,
        icon:'none'
      })
    }
    this.cateList=res.message
   this.cateLevel2= res.message[0].children
   
    
    },
    activeChanged(i){
      this.active=i
      
      //重新为二级分类赋值
      this.cateLevel2=this.cateList[i].children
      
      this.scrollTop=this.scrollTop === 0 ? 2 : 0
      
      //跳转到商品列表页面
    
    },
    gotoGoodList(item) {
      uni.navigateTo({
        url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
      })
      
    },
    gotoSearch(){
     uni.navigateTo({
       url:'/subpkg/search/search'
     })
    }
    
    
    }
  }
</script>

<style lang="scss">
 .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;

      .left-scroll-view-item {
        background-color: #F7F7F7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;

        &.active {
          background-color: #FFFFFF;
          position: relative;

          &::before {
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #C00000;
            position: absolute;
            top: 50%;
            left: 0;
            transform: translateY(-50%);
          }
        }
      }
    }
  }
    .cate-lv2-title{
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
    
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item{
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
      
    }
  }
</style>
